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matrenka [14]
3 years ago
5

Jana is proving that the following trigonometric identity is true: cos(−θ)⋅tanθ=sinθ Which step would be the first line of her p

roof? cosθ⋅tanθ=sinθ cos(−θ)⋅tan(−θ)=sinθ cos(−θ)⋅tanθ=sin(−θ) cosθ⋅tan(−θ)=sinθ
Mathematics
1 answer:
Free_Kalibri [48]3 years ago
7 0

Answer:

Step-by-step explanation:

The given trigonometric identity is .

Jana has to recall that, the cosine function is an even function.

For that matter, .

Jana has to apply this property by substituting  for  in the given identity to obtain,

.

Note that, the sine and the tangent functions are odd functions

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